serial: ns16550: Add access functions that don't need platdata

For the debug UART we need to be able to provide any parameters before
driver model is set up. Add parameters to the low-level access functions
to make this possible.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/serial/ns16550.c

@@ -55,17 +55,9 @@ DECLARE_GLOBAL_DATA_PTR;
 #endif /* CONFIG_SYS_NS16550_IER */
 
 #ifdef CONFIG_DM_SERIAL
-static void ns16550_writeb(NS16550_t port, int offset, int value)
-{
-	struct ns16550_platdata *plat = port->plat;
-	unsigned char *addr;
 
-	offset *= 1 << plat->reg_shift;
-	addr = map_sysmem(plat->base, 0) + offset;
-	/*
-	 * As far as we know it doesn't make sense to support selection of
-	 * these options at run-time, so use the existing CONFIG options.
-	 */
+static inline void serial_out_shift(unsigned char *addr, int shift, int value)
+{
 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
 	outb(value, (ulong)addr);
 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
@@ -73,19 +65,14 @@ static void ns16550_writeb(NS16550_t port, int offset, int value)
 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
 	out_be32(addr, value);
 #elif defined(CONFIG_SYS_BIG_ENDIAN)
-	writeb(value, addr + (1 << plat->reg_shift) - 1);
+	writeb(value, addr + (1 << shift) - 1);
 #else
 	writeb(value, addr);
 #endif
 }
 
-static int ns16550_readb(NS16550_t port, int offset)
+static inline int serial_in_shift(unsigned char *addr, int shift)
 {
-	struct ns16550_platdata *plat = port->plat;
-	unsigned char *addr;
-
-	offset *= 1 << plat->reg_shift;
-	addr = map_sysmem(plat->base, 0) + offset;
 #ifdef CONFIG_SYS_NS16550_PORT_MAPPED
 	return inb((ulong)addr);
 #elif defined(CONFIG_SYS_NS16550_MEM32) && !defined(CONFIG_SYS_BIG_ENDIAN)
@@ -93,12 +80,37 @@ static int ns16550_readb(NS16550_t port, int offset)
 #elif defined(CONFIG_SYS_NS16550_MEM32) && defined(CONFIG_SYS_BIG_ENDIAN)
 	return in_be32(addr);
 #elif defined(CONFIG_SYS_BIG_ENDIAN)
-	return readb(addr + (1 << plat->reg_shift) - 1);
+	return readb(addr + (1 << reg_shift) - 1);
 #else
 	return readb(addr);
 #endif
 }
 
+static void ns16550_writeb(NS16550_t port, int offset, int value)
+{
+	struct ns16550_platdata *plat = port->plat;
+	unsigned char *addr;
+
+	offset *= 1 << plat->reg_shift;
+	addr = map_sysmem(plat->base, 0) + offset;
+	/*
+	 * As far as we know it doesn't make sense to support selection of
+	 * these options at run-time, so use the existing CONFIG options.
+	 */
+	serial_out_shift(addr, plat->reg_shift, value);
+}
+
+static int ns16550_readb(NS16550_t port, int offset)
+{
+	struct ns16550_platdata *plat = port->plat;
+	unsigned char *addr;
+
+	offset *= 1 << plat->reg_shift;
+	addr = map_sysmem(plat->base, 0) + offset;
+
+	return serial_in_shift(addr, plat->reg_shift);
+}
+
 /* We can clean these up once everything is moved to driver model */
 #define serial_out(value, addr)	\
 	ns16550_writeb(com_port, addr - (unsigned char *)com_port, value)